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drm/i915: Factor out a helper to disable the DPCD training pattern

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To prepare for a follow-up LTTPR change factor out a helper to disable
the training pattern in DPCD. We'll need to do this for each LTTPR
(without programming the port to output the idle pattern) when training
in LTTPR non-transparent mode.

While at it also move the disable-link-training logic from
intel_dp_set_link_train() to intel_dp_stop_link_train(), since the
latter is the only user of this.

v2:
- Move the disable-link-training logic to intel_dp_stop_link_train()
  (Ville)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201007170917.1764556-4-imre.deak@intel.com
This commit is contained in:
Imre Deak 2020-10-07 20:09:14 +03:00
parent 0a5991f5d0
commit c43027a9a3
1 changed files with 17 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

33
drivers/gpu/drm/i915/display/intel_dp_link_training.c
View file

@ -94,26 +94,18 @@ intel_dp_set_link_train(struct intel_dp *intel_dp,
u8 dp_train_pat)
{
u8 buf[sizeof(intel_dp->train_set) + 1];
int ret, len;
int len;
intel_dp_program_link_training_pattern(intel_dp, crtc_state,
dp_train_pat);
buf[0] = dp_train_pat;
if (intel_dp_training_pattern_symbol(dp_train_pat) ==
DP_TRAINING_PATTERN_DISABLE) {
/* don't write DP_TRAINING_LANEx_SET on disable */
len = 1;
} else {
/* DP_TRAINING_LANEx_SET follow DP_TRAINING_PATTERN_SET */
memcpy(buf + 1, intel_dp->train_set, crtc_state->lane_count);
len = crtc_state->lane_count + 1;
}
/* DP_TRAINING_LANEx_SET follow DP_TRAINING_PATTERN_SET */
memcpy(buf + 1, intel_dp->train_set, crtc_state->lane_count);
len = crtc_state->lane_count + 1;
ret = drm_dp_dpcd_write(&intel_dp->aux, DP_TRAINING_PATTERN_SET,
buf, len);
return ret == len;
return drm_dp_dpcd_write(&intel_dp->aux, DP_TRAINING_PATTERN_SET,
buf, len) == len;
}
static bool
@ -406,6 +398,13 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp,
return channel_eq;
}
static bool intel_dp_disable_dpcd_training_pattern(struct intel_dp *intel_dp)
{
u8 val = DP_TRAINING_PATTERN_DISABLE;
return drm_dp_dpcd_write(&intel_dp->aux, DP_TRAINING_PATTERN_SET, &val, 1) == 1;
}
/**
* intel_dp_stop_link_train - stop link training
* @intel_dp: DP struct
@ -427,8 +426,10 @@ void intel_dp_stop_link_train(struct intel_dp *intel_dp,
{
intel_dp->link_trained = true;
intel_dp_set_link_train(intel_dp, crtc_state,
DP_TRAINING_PATTERN_DISABLE);
intel_dp_program_link_training_pattern(intel_dp,
crtc_state,
DP_TRAINING_PATTERN_DISABLE);
intel_dp_disable_dpcd_training_pattern(intel_dp);
}
static bool